Make outline of rubberband selection fixed width

CHANGELOG.rst

@@ -11,6 +11,8 @@ Fixed
 
 * Double click to zoom an item and double-clicking again should now always
   correctly go back to the previous position
+* The outline of the rubberband selection now stays the same size
+  regardless of zoom
 
 
 0.1.0 - 2021-07-10

beeref/selection.py

@@ -610,6 +610,10 @@ class RubberbandItem(BaseItemMixin, QtWidgets.QGraphicsRectItem):
         color = QtGui.QColor(SELECT_COLOR)
         color.setAlpha(40)
         self.setBrush(QtGui.QBrush(color))
+        pen = QtGui.QPen(QtGui.QColor(0, 0, 0))
+        pen.setWidth(1)
+        pen.setCosmetic(True)
+        self.setPen(pen)
 
     def __str__(self):
         return (f'RubberbandItem {self.width} x {self.height}')